An event takes an imaginary journey, known as propagation, through the tree structure of the document.
事件按照文档的树状结构进行假想的旅行，这个过程称为传播。
RXP works by building a compact in-memory tree structure of the XML document being parsed.
RXP通过为所要解析的XML文档构建一个紧凑的内存树结构而工作。
AXIOM provides a virtual document model it expands on demand, building only as much of the tree structure document model representation as has been requested by the client application.
AXIOM提供了一种可以按需扩展的虚拟文档模型，仅构建客户端应用程序所请求的树结构文档模型表示。
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